Optimal mean-reverting spread trading: nonlinear integral equation approach

We study several optimal stopping problems that arise from trading a mean-reverting price spread over a finite horizon. Modeling the spread by the Ornstein–Uhlenbeck process, we analyze three different trading strategies: (i) the long-short strategy; (ii) the short-long strategy, and (iii) the chooser strategy, i.e. the trader can enter into the spread by taking either long or short position. In each of these cases, we solve an optimal double stopping problem to determine the optimal timing for starting and subsequently closing the position. We utilize the local time-space calculus of Peskir (J Theor Probab 18:499–535, 2005a) and derive the nonlinear integral equations of Volterra-type that uniquely characterize the boundaries associated with the optimal timing decisions in all three problems. These integral equations are used to numerically compute the optimal boundaries.     

Matching Ethical Work Climate to In-role and Extra-role Behaviors in a Collectivist Work Setting

This paper studies the relationship between organizational ethical climate and the forms of organizational citizenship behavior (OCB), including in-role and extra-role behaviors, and examines the mediating effect of employee loyalty. A sample of employees from a traditional Hong Kong-based company was used as a study group. The purpose of this study was to examine the causes and implications of how various ethical work climates affect employee performance. Based on a model proposed by Victor and Cullen, ethical climate is arranged from lower levels to higher levels. The results suggest that lower levels of ethical climate (instrumentality and independence), characterizing a weak relational contract between employee and employer, are associated with negative extra-role behavior. In contrast, higher levels of ethical climate (caring and law-and-code), symbolic of a strong relational contract at work, are associated with positive extra-role behavior. Moreover, normative commitment mediated a positive relationship between caring and identification with the company, whereas attitudinal loyalty mediated the negative relationship between independence and altruism. Implications for future research and practice are discussed. Dr. Alicia Leung is an Associate Professor of Management at the Hong Kong Baptist University. She received her Ph.D. degree in Management Learning from the University of Lancaster, U.K. She is active in researching and writing materials about Asian organizations and management issues. Her research interests include gender issues and feminist methodology, business ethics, corporate governance, and strategic management in the Asian context.     

Comovement of dairy product futures and firm value: returns and volatility

This study investigates the exposure of dairy firm stock prices to the prices of dairy product futures, in terms of returns and volatility, from May 2013 to April 2018. Stock price returns are regressed against an index of the futures price returns to four dairy products – milk, cheese, butter and dry whey – to isolate the effects of the dairy futures price returns. Dairy product futures price returns are found to be significant in the regression in the first three years of the sample period, with a mean coefficient of ?0.024. Using the Diebold‐Yilmaz volatility spillover method of forecast error variance decomposition, we show that the volatility of the four dairy product futures accounted for an average of 5.49 per cent of the volatility of dairy stock prices. These results suggest that the prices of dairy firms have minimal exposure to dairy product futures prices. This has implications for dairy firms and investors, who seek to understand volatility and returns in the dairy products and the stocks they trade in, and for policymakers, who seek to control or mitigate undesirable dairy product price volatility.     

The impact of workplace ostracism in service organizations

This study examines the effects of personal and situational determinants on work engagement and service performance. Drawing on Conservation of Resources (COR) Theory, we hypothesize that workplace ostracism will reduce work engagement and service performance and that highly neurotic individuals are more susceptible to ostracism. To test the model, we collect longitudinal data from 304 supervisor–subordinate dyads in 19 Chinese hotels. As predicated, we find that: (1) workplace ostracism is negatively related to service performance; (2) workplace ostracism negatively impacts employee service performance via work engagement; and (3) neuroticism strengthens workplace ostracism's direct effect on work engagement and indirect effect on service performance. The implications of these findings, the strengths and limitations of the study, and directions for future research are discussed.     

The sensitivity of the RESET tests to disturbance autocorrelation in regression analysis

This paper investigates the sensitivity of the RESET tests, proposed by Ramsey (1969) and modified by Thursby and Schmidt (1977), to disturbance autocorrelation in regression analysis. Porter and Kashyap (1984) show that RESET is not robust to autocorrelated disturbance when there is a highly autocorrelated regressor in the model. We show that RESET is sensitive to disturbance autocorrelation even when the regressors are not autocorrelated. We explain the findings of Thursby (1979) and Porter and Kashyap (1984) as well as our result by showing that a spurious correlation between the regressor and the disturbance is responsible for the serious size distortion of the RESET tests. First version received: June 1999/Final version received: November 2000     

Employment Effects of the Affordable Care Act Medicaid Expansions

We examine whether the recent expansions in Medicaid from the Affordable Care Act reduced “employment lock” among childless adults who were previously ineligible for public coverage. We compare employment in states that chose to expand Medicaid versus those that chose not to expand, before and after implementation. We find that although the expansion increased Medicaid coverage by 3.0 percentage points among childless adults, there was no significant impact on employment.     

Does location matter for disclosure? Evidence from geographic segments

The segment disclosures of multinational companies provide strategic information. We use the location characteristics of geographic segments to identify the reasons for withholding or disclosing segments. We examine segment data from around the adoption of IFRS 8, a reporting standard that requires firms to reveal more disaggregated information. Consistent with a proprietary cost motive for nondisclosure, we find that segments in regions that are deemed better for business tend to be hidden, while higher entry barriers for a segment are positively related to disclosure. These effects appear to be stronger for firms for which proprietary cost motives are more important. Among the previously unrevealed segments, proprietary costs explain the nondisclosure of segment earnings and other relevant financial information for investors.     

A semantic similarity analysis of Internet of Things

ABSTRACT

Internet of Things (IoT) has gradually become one of the most popular topics among both academia and industry, and it is considered as a crucial part of future Internet. However, very few objective and systematic review was conducted to address high-value articles and summarize the intellectual components from journals for examination and identification of the intellectual core and structure of IoT. Therefore, this study conducted a co-citation analysis for IoT by using 68 high-value articles retrieved within 1457 source papers from Web of Science online database. By using factor analysis, ten critical factors were identified, which includes (1) frameworks and challenges of IoT; (2) current situation of IoT in different applications; (3) interactions of IoT; (4) security issues of IoT; (5) application domains of IoT; (6) data management of IoT; (7) IoT in product lifecycle management; (8) enabling technologies of IoT; (9) IoT in smart cities; (10) IoT in recommender systems. Hierarchical Custer Analysis and Multidimensional Scaling were used to graphically illustrate the intellectual elements of IoT. In the current findings, fundamental elements of IoT including architectural framework, enabling technologies, network communication, data management, and IoT interactions were discussed with a series of challenges for wider and deeper IoT applications.     

Speculative Futures Trading under Mean Reversion

This paper studies the problem of trading futures with transaction costs when the underlying spot price is mean-reverting. Specifically, we model the spot dynamics by the Ornstein–Uhlenbeck, Cox–Ingersoll–Ross, or exponential Ornstein–Uhlenbeck model. The futures term structure is derived and its connection to futures price dynamics is examined. For each futures contract, we describe the evolution of the roll yield, and compute explicitly the expected roll yield. For the futures trading problem, we incorporate the investor’s timing option to enter or exit the market, as well as a chooser option to long or short a futures upon entry. This leads us to formulate and solve the corresponding optimal double stopping problems to determine the optimal trading strategies. Numerical results are presented to illustrate the optimal entry and exit boundaries under different models. We find that the option to choose between a long or short position induces the investor to delay market entry, as compared to the case where the investor pre-commits to go either long or short.